Incubating and Hatching Call Ducks

I am going to be hatching some call duck eggs for 1st time in a couple days in a hova bator 1588 with turner. I just want to make sure I have all temp/humidity right.. before putting them in. I read to hatch them at 99.25-99.75 degree and humidity at 55 and increase humidity to 75 @ hatching time. Stop turning eggs 3 days before hatch date. And call ducks take 26-27 days to hatch. Also will it hurt to put 7 chicken eggs in or do they need different temp/humidity? Anything else I need to know? Any help/info very appreciated!